WHY NOT BLOCK **** FUNDS - YOU ARE SUPPOSED TO PROTECT MY MONEY THATS WHAT I PAY FEES FOR

Purchased online, 5 hours later realised it was a ****. Called ABSA ***** who transferred me thru to department to block my debit card. Waited a week whilst the funds remained uncleared in my account. Rec sms stating online purchase unsuccessful, card blocked but yet the transaction went through. Why didnt ***** line neither debit card dept block the payment immediately? lodged complaint with debit disputes, waited 5 days with generic response, not answered my questions. Sent a follow-up email on 19.7 still waiting for response. Now received same sms, sent another email to ABSA.